General description
The TDA8025 is a cost-effective analog interface for asynchronous smart cards operating at 3 V, 1.8 V or optionally, 1.2 V. Using few external components, the TDA8025 provides integrated supply, protection and control functions for a range of applications.

Features
■ Integrated circuit smart card interface
■ 3 V, 1.8 V or 1.2 V smart card supply
■ Low power consumption in inactive mode
■ Three protected, half duplex, bidirectional buffered input/output lines (C4, C7 and C8)
■ VCC regulation:
    ◆ 3 V, 1.8 V or optionally 1.2 V at ± 5 % using one 220 nF and one 470 nF low ESR multilayer ceramic capacitor.
    ◆ Current pulse handling for pulses of 40 nAs at VCC = 3 V, 15 nAs at VCC = 1.8 V or VCC = 1.2 V up to 20 MHz
■ Thermal and short-circuit protection for all card contacts
■ Automatic activation and deactivation sequences triggered by short-circuit, card take-off, overheating, falling VDD(INTF) and VDD(INTREGD)
■ Enhanced card-side ElectroStatic Discharge (ESD) protection of > 6 kV
■ Clock signal using the internal oscillator or an external crystal (≤ 26 MHz) connected to pin XTAL1
■ Card clock generation up to 20 MHz with synchronous frequency changes of fxtal, 1⁄2 fxtal, 1⁄4 fxtal or 1⁄8 fxtal using pins CLKDIV1 and CLKDIV2
■ Non-inverted control of pin RST using pin RSTIN
■ NDS certified
■ Supply supervisors during power on and off:
    ◆ VDD(INTREGD) using a fixed threshold
    ◆ VDD(INTF) using resistor bridge threshold adjustment
■ Built-in debouncing on card presence contacts (typically 4.5 ms)
■ Multiplexed status signal using pin OFFN

Applications
■ Pay TV
■ Electronic payment
■ Identification
■ Bank card readers